Effect of step change of water supply temperature on heating measurement system

In heating measuring system, the water supply temperature of the heat source is requested invariable, it adopts the mode of changeable flow adjustment to change the capacity of heat supply, but in the actual operation it relates to the maintenance of the system and the sewage discharge, especially to the heating system of the boiler room. Furthermore, the heating measurement system unsurely employed a ball valve to control the flow rate on the pipe inlet of the house, the valve remain turn on when the inhabitant at home and remain cut off when the inhabitant go to work. All these reasons result in the temperature of water supply system has a sudden variety. In this paper, the characteristic of the temperature distribution curve of radiator was analyzed in transient, according to the the parallel moving presumption, the functional relation between heat dissipating capacity of radiator and the time in transient was put forward, finally, the measurement error of steady-state formula was compared under different water supply temperature and different temperature step change. It provides a valuable reference for the study of dynamic characteristics of variable flow heating system.